This section is from the book "The Gardener's Monthly And Horticulturist V20", by Thomas Meehan. See also: Four-Season Harvest: Organic Vegetables from Your Home Garden All Year Long.
A few days ago I found a young plant of Browallia with a multitude of mealy bugs on it, and as said insect is my favorite aversion, I put the whole affair in the feeding tank of my hot water fixings, and, I think, I fixed the bugs, while the plant seems none the worse. Water not over 120° Fahr. Let"Reader" try it and report.
[Water heated to 120° is an infallible remedy against all insects where the plants can be dipped! for an instant therein, and where a plant is trained on a trellis it might, perhaps, be untwined and get a dip when infested. - Ed. G. M].